获取一个视频网址的第一帧或者其他时间段的图片

private Bitmap createVideoThumbnail(String url, int width, int height) {//其中URL是视频地址 如http://123.56.82.95/data/upload/20160614/aabb.mp4
    Bitmap bitmap = null;
 MediaMetadataRetriever retriever = new MediaMetadataRetriever();
    int kind = MediaStore.Video.Thumbnails.MINI_KIND;
    try {
        if (Build.VERSION.SDK_INT >= 14) {
            retriever.setDataSource(url, new HashMap<String, String>());
 } else {
            retriever.setDataSource(url);
 }
        bitmap = retriever.getFrameAtTime(100);//100表示视频的一个类似时间点或者频数
 } catch (IllegalArgumentException ex) {
        // Assume this is a corrupt video file
 } catch (RuntimeException ex) {
        // Assume this is a corrupt video file.
 } finally {
        try {
            retriever.release();
 } catch (RuntimeException ex) {
            // Ignore failures while cleaning up.
 }
    }
    if (kind == MediaStore.Images.Thumbnails.FULL_SCREEN_KIND && bitmap != null) {
        bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height,
 ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
 }
    return bitmap;
}

我这个怎么就不行了啊！我这代码是我的精华啊！